Each egde of a cube is increased by 20 percente. what is the percentage increase in the surface area of the cube ??

Let original edge of cube = a

Surface area = 6a²

Edge of new cube = a + 20% of a = 6/5 a

Surface area of new cube = 6(6/5a)²

Increase in surface area = New - original / original * 100%

                                   = 6a²[(6/5)² - 1] / 6a² * 100%

                                   = 11/25 * 100%

                                   = 44%